If I don't fast for a test I need to fast for will it change the result of any other tests done along which did not need fasting?

Fasting. No it shouldn't it will change the blood sugar and lipids for sure.
Not usually. Certain tests, for diagnosing reasons are recommended to fast for, such as the lipid panel and a diabetes test for your Blood sugar. Other tests may net require fasting and "not fasting" will not affect them.