How is kenalog (triamcinolone) injections on your blood sugar level compared to a cortisone injection?

Depends. There are different injection types. Intralesional which is a small amount in the surface of the skin or intramuscular which is within the muscle. There are also different doses. All of that would be necessary to answer your question. In general, the deeper the injection and the higher the strength the more likely it would impact your blood sugar.