d15 pistons in a z6 block

[92d15hatch]

i just seen that d16z6 pistons are dished and d15b7 pistons are flat what would the compression be if i used d15 pistons in a d16z6 block also i was told d16a6 pistons were domed so a6 pistons in a z6 block what would that compression be as well thanks for your help

[jlicrx]

D15B7 pistons in D16Z6 with D16Z6 head and D16Z6 gasket (pistons will be about 0.028" above the top of the block)
compression ratio = 11.71:1

D16A6 has pistons with slight dish (not domed)
D16A6 pistons in D16Z6 with D16Z6 head and D16Z6 gasket
compression ratio = 9.96:1