Can I change a needle on a syringe for drawing up, and then change it back?

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Hi all:) what the title says basically, I need an 8mm needle for subQ estrogen injections, and I can only get those in my country when attached to an insulin syringe. I was wondering if I'd then be able to change the needle to a 16mm, draw up, and then change back for injecting? Does this risk contamination or is there a safe way to go about it?

Thanks

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