Putting speakers next to other speakers

I have two systems, The main one at home which has B&W 800d3s, and the "less expensive" in my office (smallish) basement has Proac d100's. I am pretty sure my favourite speakers are the Proacs, but they are 200 miles away and will take some hefty lifting to bring home. My aim would be to put them both side by side at home and just swap speaker cables from time to time to test and then decide which set up to persevere with.
Yes I know it is frowned upon ... cross vibration etc etc ... in theory .. but IN PRACTICE can this work? The Proacs are big and are very close to my basement wall but sound great. From a layman's point of view what is difference between a wall and close speaker? I reckon in practice all will be ok - but it is an experiment that will take significant lugging around and swearing! Not something lightly undertaken.
I am not looking for technical reasons why I am doomed to failure .. I can read enough of that already. I am looking for the real world good news ACTUAL experiences which defy gloomy theorists. Both speakers are built as heavy as sin .. so should just be normal "room obstacles" that we have to cope with in a living room.