don't bother
Apart from the Perry versions looking slightly more elegant and in scale, it is really hard to tall any difference.
I get Your point
compatibles should not be bulkier than Conquest nor slimmer/smaller than Perry
I noticed these fine ranges some time ago and became interested, and I asked myself who copied whom here...

To be honest, I always asked myself how the canadian native americans who operated the boats in the Sudan might have looked like....

but this is definitely offTopic