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Hello, I have a german MacBook Pro Model A1502 EMC 2835. My question: can I use other A1502 Keyboards and Backlights with different EMCs in my Laptop? Thanks a lot!

Yes you can, A1502 late 2013-2015 keyboards are compatible with each other. Just make sure the layout is the same. For example, UK and Italian keyboards will work as replacements, since the enter key is the same shape. Japanese and US layouts will not fit, since the shape of the enter key is different.

One solution would be to use a German-English skin. It would also help protect you from spills : https://www.amazon.com/Keyboard-Notebook