Contact lenses: Do the Base curve and Diameter particularly matter when ordering them?

I m new to this question forum, but would preferably like an answer from a professional.

I am ordering lenses from Visiondirect.com as a last resort to get some in time for my holiday next Saturday.

My opticians, who are reluctant on giving me them on time as they are overbooked did not provide me with the Base Curve and Diameter values, although I have the SPH (Power values.) So I just wanted to know if the standard Base Curve (8.6) and Diameter (13.8) offered by the site particularly matter? I ve not been diagnosed with any health conditions either.

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