Can't say for Oxycheq, but I have both Dive Rite (Travel EXP) and Halcyon (Evolve 40) wings. The parts like dump valve and inflator hose assembly are generic and similar.
The outer material are different, where the Halcyon uses a thicker, albeit rougher material, while the DR is rather thin. DR wings have the "Armored XT" version, but I can't really comment on that. The ones I've seen in the shop seem more plasticky/rubbery. Maybe someone who dives it can comment?
The bladder of the Travel EXP, I believe is a generic polyurethane bladder. It's bigger than the wing shape of the Travel EXP and so, there's lots of creases and crumples in it, especially when inflated.
The bladder on the Halcyon seems to be made to fit, and when inflated, fills up the whole wing nicely.