Bras 38C verses 36C, are they interchangeable?

Anonymous
My wife's bra size is 38C. Lately, she was not able to find her size at a store, so a sales girl told my her that she could go a cup size higher by going a chest size lower. So she convinced her in getting 36Ds. I hate them. They cover her chest completely and it seems like she has a pillow under her shirts. Do you think these 2 sizes are interchangeable.?
Bras 38C verses 36C, are they interchangeable?
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