I hear ya on the look being rebranded Reeflo pumps but have a tough time thinking MRC would take another pump and simply rebrand it. A phone call or email to Raj asking specific questions might be the answer. I was thinking the LP-4200 might suit your needs well. Perhaps another question for Raj.
I do think they are the same baldor motor block (Hense the similar look) but maybe the head assembly is different? Maybe they solved the seal issues? I'll definitely send Raj an email and see what he has to say
Edit: looks like the max head on the 4200 is 12 Ft.... I'd have the get the 6100 to make it work.