I am so sorry if this is in the wrong forum section this is my first time posting. I am buying a Mac Pro 4.1 and asked myself if the Hard Drive Trays from the Mac Pro 1.1 are compatible and fit in the 4.1
h9826790 is correct, here is a link listing both styles...2006-2008 and 2009-later
https://eshop.macsales.com/search/?q=Mac+Pro+HDD+sled
The only difference I see is that the 2009 and up have 6 screws instead of 4 so with hard drives that would not make a huge difference, unless the sizes are different?