If I have other devices with the same Apple ID will they be affected if I choose to change ID on one of them.

If by "change" you mean use a different email address, no, as long at they can connect to the Internet the change should reflect on other devices too.

Here's how you change the email address you use for your Apple ID:

1. Go to https://appleid.apple.com and sign in.

2. In the Sign-In and Security section, choose Apple ID.

3. Enter the email address that you want to use as your Apple ID.

4. Choose Change Apple ID.

5. If you changed your Apple ID to a third-party email address, check your email for a verification code, then enter the code. Learn what to do if you didn't get the email. --> If you didn't receive your verification or reset email - Apple Support

6. If you use services like iCloud or Messages to share with friends and colleagues, sign in to those services with your updated Apple ID. --> What to do after you change your Apple ID or password - Apple Support

For more details, read the document: "Change your Apple ID" --> Change your Apple ID - Apple Support

If by "change" you mean sign into a different Apple account, they shouldn't be affected. It would be as if the device belonged to a completely different person.