My blood pressures (R. And L. Arms) are somewhat different. L. 1st reading: 117/77 2nd: 116/75 R. 1st: 117/83 2nd 115/82 Cause for concern?

Nope. Excellent blood pressures and entirely expected measurement-to-measurement variation. Keep up with your excellent health!
None whatsoever. Perfectly normal. You must've just gotten the BP cuff.....Enjoy taking your pressures......try your ankles and see what you get.....DO NOT TRY THE NECK! LOL... Your pressures are fine....little difference from one side to the other is no big deal....BIG DIFFERENCES yes....little differences....no. Cheers!