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For removing a sticky label (or nail varnish) there might not be much difference with some brands - personally I wouldn't risk it for something I want to repair rather than replace.
For any specific brand, there should be a data sheet with ingredients, e.g.
https://www.sainsburys.co.uk/gol-ui/product/sainsburys-/sainsburys-nail-polish-remover-250ml
or even a safety data sheet such as
https://www.leading-solvents.co.uk/uploads/pdf/bcde7472fd4bced3cf7f346d443124eb.pdfGiven that solvent welding usually requires clean surfaces and no contamination, I'd check before introducing something like hydrogenated castor oil to a repair. There will be some nail varnish removers that will work as planned, and I'm probably being over cautious...
MrE-
Yes I agree with you, as you say sticky label (or what nail varnish remover was invented for) is great. Would go further and say that any thing that requires a clean surface for bonding needs a clean surface. Would say over cautious, just less to go wrong and have to do again. Or break something so have buy it.
lynx
From being told on this very forum, there is no difference between 'proper' acetone and acetone nail varnish remover. Yes, I know.