BBC oil pan bolt patterns

I am looking for info on the different oil pan bolt patterns offered for BBC.

Moroso lists the following info in oil pan descriptions, are these 3 the same?:
-Merlin and CNC BBC Blocks w/ 10-3/8" Wide Pan Rails
-Donovan Style BBC Blocks w/ 10" & 10-3/8" Wide Pan Rails
-BBC Donovan, Merlin Style Blocks w/ 10" and 10-3/8" Wide Pan Rails

The Dart Big M description says "Stroker pattern at mains", is this the same as Moroso's descriptions above?

Than there is DRCE and DRCE II (I think they are different?)

Any info on this is appreciated.