Let me go back to 2003. In early 2003 I was going to Buy a X465 2WD air cooled. Deere stated the 45 Loader did not work on the X465 do to the fact the 45 loader sub frame Interfered with cooling on the air cooled engine. Deere world Wide Told me a 40 loader from the 425 thru 455 would fit on the X465 because the 40 loader sub frame would not interfere with cooling on the X465 air cooled tractor. But I ended up wanting a little more Capable Loader so I went with a X485 with a 45 loader.
For the Most Part the X700 signature series frame is the same as a X465's frame. Though the signature frame is thinner in key areas and doesn't have the Loader sub frame pass through holes. But that besides the point. Length and width of the frame are the same. Now You might have to drill some Holes In your frame to get it to work right. Or You could build a different sub frame sort of following what JBible did for his 45 loader in the Link above
But the CTC loader would be a a faster and Not require any hole new hole Put In your frame and fits all X700 signature series tractors 2013 till present 2013 John deere x ultimate
When the X700 signature series was first thought up Deere had planned to do a new loader for the Signature Series That would have had a sub frame similar to the 40 loader. But the bean counters nixed the Idea( Nixing the loader had nothing to Do with the need for ROPS as some think)
The ROPS was do to weight and new government regulations. So Deere didn't think ROPS would go over very well on the X700 series in North America. So the the weight was dropped for the Signature series so they wouldn't have to put ROPS on there Super Garden tractors
BTW I had a 425 with a 40 loader when I bought the X485. Dealer was all set to move the 40 loader over to the X465 they had in stock. But I changed my mind at the last minute and went with the X485 with 45 loader.