210/225 blocks are supposed to have extra strengthening in the webbing but as Bill said all the 06A blocks are interchangable with any 20v head... you can't use inline blocks (058/06B) though but you can use inline 20v heads on transverse blocks...
Be aware of compression ratio differences if you plan to use pistons from a doner block and there are some valve train differences between some heads (noticed on an AMK to AEB head swap where valve collet grooves were different)...
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