Compare two sheets in a Numbers document
How do I compare 2 sheets in a single Apple Numbers document for differences?
iPad Pro, iPadOS 18
There isn't an easy way native to Numbers as you cannot have two "windows" open on the same document.
On the Mac one workaround is to duplicate your document (File > Duplicate) and have both documents open at the same time so you can put the versions side by side on your display to compare.
You could also export to pdf and have the pdf open at the same time as your original document.
On the iPad the workarounds appear to be more difficult.
If the information is not sensitive you could try uploading the two sheets to an AI and ask it to compare.
SG