Help, please - cannot find reason of different color display

Hello!

I have two documents with a table in which the row fill shows differently:

I cannot determine why, because:

• both use the same color gradient (CMYK type, C=30, M=20, Y=19, K=58, Tint 10%)
• the "Transparency Blend Space" setting on both is the same
• the "Proof setup" and "Proof colors" settings on both are the same
• the "Fills" settings for the tables are identical

I don't see why the grey fill on the left document is brighter. Do you have ideas what could cause could be? TIA.