Here's a workaround option to consider.
V11
(top left) Studio > Audit
Filter Description = SaveTableTransform
Locate audit log entries for the edited transform table of interest.
Right-click each entry > View contents
Copy and paste full contents to any text editor (e.g. Notepad++), one file per audit log entry.
V12
(top left) Project > Check in history
Expand Date entries (triangle icon) to view details of a particular check in.
Locate audit log entries for the edited transform table of interest.
Right-click each entry > View contents
Copy and paste full contents to any text editor (e.g. Notepad++), one file per audit log entry.
A text comparison tool (e.g. WinMerge for Windows, XCode/Filemerge for Mac) shows side-by-side versions with differences highlighted.

(Click to enlarge screenshot)
The example above shows two modifications to the table:
1. Data filter added: Fixed Asset Ledger ID Not Equals FA0013
2. IT Resource Sub Tower column formula modified from
="ITRST" && TRIM(Split(IT Resource ID,2))
to
=TRIM(Split(IT Resource ID,2))
Caveat to this approach: the default ("out of the box") version of a transform table has no audit log entry.
So if you're trying to analyze the first modification to the table, you'll have nothing to compare it to (i.e., you'll only have one audit log entry, not two).