Outer Limits 4x4 Board

Hello everyone. I think this might be a silly question, so here goes. I have just sold one of my rebuilt TD42's so the extra cash will fund my second build, and I was wanting to upgrade.

I currently have a GT2860rs on my truck and would like to go to the GT2871rs, but I would like to know if I can just buy a cartidge (CHRA) and this will fit into the disco potato's compressor and exhaust housing, or will I need to buy a whole turbo?

Thanks!

The compressor wheel is bigger, you will need another compressor cover as well.

Andy