So I was trying to do some improvisation using simple chords, scale patterns, and different techniques in a guitar that is tuned in drop C. I was aiming to be in the key of C and as I was playing I noticed that I was playing chords and scales that would be in the correct positions for the key of C on a guitar in standard tuning. My question which may sound kinda stupid is would I still be able to say I'm playing in the key of C or since I was tuned to drop C would it be completely different? To add on to this if I play a chord, I'll just use a C major as an example, in the open position of a guitar tuned to drop C could I still call it a C major chord?