Are PayPal Shipping Calculations Accurate for FedEx?

I am aware that Paypal offers some fields in your seller profile for entering the weight and price for shipping costs and I notice that when you have it turned on and make a test order it makes you enter your zip code and then appears to give you a price based on that.  But I don't see anywhere that it says whether this is UPS, FEDEX, or USPS.... is it universal?

We want to use Paypal to take payments on our website and we also need to have shipping calculation in real-time and to be paid with their transaction. But we prefer to use Fedex. Will the paypal shipping calculations be accurate for Fedex, or what carrier do they use to base their calculations on?

Thanks for your help.
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I understand your concern as shipping costs change constantly. To stay ahead of the curve it is best to open a full merchant account to take advantage of flexibility to control account receivables. Tools are available direct from FedEx:
     However, if you need ease of use I would increase cost with a 10% margin which would allow you to cover shipping price discrepancies. Also, PayPal offers great customer support, you should call them directly regarding your account options: 1-888-221-1161

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