Provided it's the same dimension, no problem at all. Same wall thickness, both clamp ring style windows. Our upper on the 28BHBE does open. It's the frameless, but pretty much same opening regardless of framed or frameless. They both install the same way.
John and Rebecca Dickson
Emma-8 / Little John-5 / Iva-1+
2013 Ford F-350 Lariat FX4, CC LB PSD, DRW
2015 Jayco Jay Flight 28BHBE (#8)