As far as geometry numbers go .... you should be able to find the geometry numbers (top, head, and seat tubes, chain stays, wheel base, tube angles) for each on Fuji's site. Stack and Reach are pretty much telling .... but ...

if the numbers are pretty similar, then with a slightly longer or shorter stem, more or fewer spacers, seat setback ... you can make a bike fit over a pretty wide range of frame sizes.

Most important thing is ultimately, how it feels to you ... if the numbers say it is wrong but it feels right, ti is right.

Also, there is no universal size system as there is with shoes (well, I guess there are three with shoes ... ) One vendor might measure and name its bikes differently ... and another vendor, using the exact same frame frim the same factory, might call it something else. Some might measure the seat tube and call it a 46-cm, and some might measure the Virtual seat tube and call it a 52 ... you never know.

We need more info ... can you link to the two bikes please?

Why are yuo worried (besides the number difference?)