The xl hood doesn't slide out like the 220 did , which is a downgrade. Much easier to blow out rad on the older model and a slower transport speed on the xl . No dust bowl precleaner before airfilter on xl too.
The frame was reinforced when the production of those machines was moved from Portage la Prairie to Hesston. I think that started with the series II swathers. Another difference is the XL's all have the black header which have a much better knife drive.