It depends on how you want to interpolate them. The‘safest’ way is likely to interpolate the longer vector to the length of the shorter vector:
A = sin((0:1053)/105)';
B = cos((0:600)/30)';
Ai = interp1((1:numel(A))', A, (1:numel(B)), 'linear', 'extrap');
You can then see the result (a sort of Lissajous figure):
figure
plot(Ai, B)
grid
