SDL Tridion does not offer you to compare different elements, there is only a comparison between versions of the same element.
If you need to make a comparison between different items (it may be interesting to know what a use case is), then you need to create something yourself. Most importantly, you start by determining what exactly you want to compare, because there will be many differences that may not interest you (different TCM URIs, different location, different file name / file name, etc.). Thus, it is not possible to conduct direct XML comparisons.
Bart koopman
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