Have 2 York compressors in my parts pile for on-board air. Both are the large, 210 model, verified by checking the end of the shaft. Only difference is that they have different heads and hose connectors. The one on the left was already being used for OBA on the donor truck(say's FoMoCo on the tag) and the one on the right(Says Motorcraft on the tag) was already unhooked when it was pulled from the vehicle so I'm not sure what they used it for.

basically I'm wondering if one is better than the other or if they just changed the shape over the years and it doesn't matter.