So when I relink a smart object having layercomps A and B inside to another psd file also having layercomps A and B Photoshop would recognize same layercomps inside new file and makes them shown in mastr/host psd file .
For some uncertain reason it works only if I "save as" the initial smart object content to a copy file . But doesn't work at all If I have unrelated document I want to re-link to.