never heard of M. lechleriana, so had to google :). I have adansonii.

here (it's a reliable site with good quality plants) it says that it has bicolor green variegation and very large leaves. it's hard to judge by the pics that he has, but my adansonii (from small cuttings) have kept very small leaves for sev years now, hardly with any perforations. how they grow outside is a diff matter of course, in FL they get very big when they climb up into trees. But they are always plain dark green.

I compared whatever images I found and it seems that perforations on adansonii(Friedrichsthalii) are much larger and there are more of them. the shape differs too: holes are rounder .

M. lechleriana has holes mostly along the central vein and not as many of them.

M. adansonii here. this a very reliable Aroid site, by the way.