How to Replace specific color to another color in Photoshop Action and Scripting

Try this using the Curves Adjustment Layer

var r = [[0,0], [0x1e,0x04], [0xda,0x8c], [255,255]];
var g = [[0,0], [0x25,0x06], [0x3c,0x1d], [255,255]];
var b = [[0,0], [0x26,0x07], [0x72,0x4c], [255,255]];
add_curves();
set_corner_curves(null, r, g, b);
////////////////////////////////////////////////////////////////////////////////////////////
function add_curves()
    {
    try {
        var r1 = new ActionReference();
        r1.putClass( charIDToTypeID( "AdjL" ) );
        var d1 = new ActionDescriptor();
        d1.putReference( charIDToTypeID( "null" ), r1 );
        var d2 = new ActionDescriptor();
        d2.putObject( charIDToTypeID( "Type" ), charIDToTypeID( "Crvs" ), new ActionDescriptor() );
        d1.putObject( charIDToTypeID( "Usng" ), charIDToTypeID( "AdjL" ), d2 );
        executeAction( charIDToTypeID( "Mk  " ), d1, DialogModes.NO );
        } 
    catch (e) { alert(e); }
    }
////////////////////////////////////////////////////////////////////////////////////////////
function set_corner_curves(c, r, g, b, k)
    {
    try {
        function line(x1,y1, x2,y2, x) { return Math.round((x2*y1 - x1*y2)/(x2-x1) + ((y2-y1)/(x2-x1))*x); }
        var d1 = new ActionDescriptor();
        var d2 = new ActionDescriptor();
        var r1 = new ActionReference();
        var l1 = new ActionList();
        r1.putEnumerated( charIDToTypeID( "AdjL" ), charIDToTypeID( "Ordn" ), charIDToTypeID( "Trgt" ) );
        d1.putReference( charIDToTypeID( "null" ), r1 );
        function set_chnl(name, m, idx)
            {
            try {
                if (m == undefined || m == null) return;
                var d1 = new ActionDescriptor();
                var r1 = new ActionReference();
                r1.putEnumerated( charIDToTypeID( "Chnl" ), charIDToTypeID( "Chnl" ), charIDToTypeID( name ));
                d1.putReference( charIDToTypeID( "Chnl" ), r1 );
                var list = new ActionList();
                var max = false;
                var xx = 255;
                for (var i = 0; i < 256; i++) 
                    {
                    if (max) { list.putInteger( 255 ); continue; }
                    for (var n = 0; n < m.length-1; n++) 
                        {
                        if (i >= m[0] && i <= m[n+1][0])
                            {
                            xx = line(m[0],m[1], m[n+1][0],m[n+1][1], i);
                            if (isNaN(xx))  continue; 
                            if (xx < 0) xx = 0;
                            if (xx >255) xx = 255;
                            list.putInteger( xx ); 
                            if (xx >= 254) { max = true; }
                            break; 
                            }
                        }
                    }
                d1.putList( charIDToTypeID( "Mpng" ), list );
                l1.putObject( charIDToTypeID( "CrvA" ), d1 );
                list = r1 = d1 = null;
                }
            catch (e) { _alert(e); }
            }
        if (app.activeDocument.mode == DocumentMode.RGB)
            {               
            set_chnl("Cmps", c);
            set_chnl("Rd  ", r);
            set_chnl("Grn ", g);
            set_chnl("Bl  ", b);
            }
        else if (app.activeDocument.mode == DocumentMode.LAB)
            {               
            set_chnl("Lght", r);
            set_chnl("A   ", g);
            set_chnl("B   ", b);
            }
        else if (app.activeDocument.mode == DocumentMode.CMYK)
            {               
            set_chnl("Cmps", c);
            set_chnl("Cyn ", r);
            set_chnl("Mgnt", g);
            set_chnl("Yllw", b);
            set_chnl("Blck", k);
            }
        d2.putList( charIDToTypeID( "Adjs" ), l1 );
        d1.putObject( charIDToTypeID( "T   " ), charIDToTypeID("Crvs"), d2 );
        var ret = executeAction( charIDToTypeID( "setd" ), d1, DialogModes.NO );
        l1 = r1 = d1 = d2 = null;
        return ret?true:false;
        } 
    catch (e) { alert(e); return false; }
    }

From (Specific Color)

C:85

Y:50 

M:0

K:0

To (Another Color )

C:50

Y:100 

M:0

K:0

Are these shape layers? If so you can use scriptlistener to select get the code to replace a color in a shape layer. Other than that you just need to have the script specify which layer you want to change and select that layer with the color.