From my own experience, you should be fine, particularly as the films are lower speed.
Theoretically there can be image deterioration, but in practice this is likely to be very minor, and probably easily correctable if scanning or printing.
OTOH, if the process and shipping charges are way excessive, I guess you'd have to think whether the images taken so far are, in fact, worth the cost? Are they important or irreplaceable, or can they be reshot on fresh film to take away any slight risk.