Amiga600 Rev1.3 issues. What are there if any?

Hi all.
I was wondering what issues there might be with revision 1.3 of the A600 motherboard when upgrading the hardware. I am thinking mostly of things that clip over the CPU. Accelerators, ram upgrades and so on. Is there any difference in compatibility, when runnning original kickroms or running one of them 3.1 burned roms that you can buy in webshops.

I haven't seen any difference, but that's only my own experience.