This happened to one of my Anniewalkers in SJPP!
She put her shoes on in the morning, got halfway to Roncesvalles, and realized she had picked up someone else's shoes in the dark morning.
Personally, I think it's your FIRST CAMINO BLESSING!
Those boots would destroy my feet on the Camino.
Pick up a pair of trail runners in Pamplona!
I suggest you do something to make it easy to recognize your shoes.
Crazy shoelaces, nail polish or fabric paint