Is It OK to Use a 20amp Tripp Lite Isobar Surge Protector Suppressor Instead of a 15amp?

I have my audio gear and TV plugged into a Tripp Lite 20amp surge protector.  The powered speakers are plugged in separately to wall outlets.  The circuit and wall outlets are 15amp.  I’m sure I have less than 100watts plus the TV into the Tripp Lite.  I bought a 20amp by mistake.  Is this OK?  If there ever was an overload the 15amp breaker at the box would trip first.  I assume the 20amp would have heavier wiring than a 15 amp.  I think the joule rating is the same for 15 or 20amp.