Head Swap ?

I have a '93 750ss that has a a 95/96 750 monster engine fitted. The previous owner said the big end was grumbling so decided to swap them over some years ago.

My question is would I be able to put the heads from the ss engine ( which came with the bike ) onto the monster engine or are there differences ?

The main reason is apart from it feeling more original I would like to get the rev counter working again (the ss clocks are not compatible with the monster engine )

Any help on this would be much appreciated.