Can't give you a go not knowing your exact computer but I have had two different versions of Finale on the same computer at the same time. All was good but perhaps not perfect. I haven't run 27.2 with 2014.5 but I had 26 and 27 at the same time, no issues.
When you get Finale 27.3, (I don't think it has been released yet) I doubt you will want or use 2014.5 any longer.
27.2 is the best Finale, so far, and no good reason to keep older versions. IMHO, as always, of course.
I have 27.2 installed on my laptop which sounds like a very similar computer to yours except I have a SSD and Win 10 on it. Finale 27.2 works very well on it.
If you're asking if 27 can import tif files, and use SmartScore Lite to recognize them, the answer is no. That capability was removed in 25, IIRC.
The OS requirements for F27 are Windows 8.1 or newer. So you may not be able to upgrade, if you’re still on 7. However, your 2014.5 should still work on Windows 8 or 10. If you upgrade, you can still use 2014.5 for the tif files, and export them as XML. Then, import the XML into 27.
Don’t waste your $79 on the limited functionality of SmartScore Piano
The lite scanning utility that came in 2014.5 was pretty limited too. That's why I bought SmartScore Pro 64. The best thing for the OP is to try the demos. Both Finale 27 and a SmartScore product. Doesn't cost a cent!
Windows 8.1, 10 or 11 (64-bit Intel or AMD processors only)
4 GB of RAM minimum.
1280x800 minimum monitor resolution.
High-speed Internet connection required for download, authorization, updates, sharing features, and help resources.
You still have Win 7 ? You may have problems running 27.2 along with your 2014.5."
Perhaps I am assuming too much but if you want Finale 27.3 (as indicated) isn't it logical to assume the OP will obtain a machine that will run it? I am sure he did not realize the minimum requirements but now he knows.