51 characters base58 or 52 characters base58?

[Haole]

Does it really matter how one stores their private keys on paper wallets?  Mine are recorded in 52 characters base58 (beginning with "K" or "L") currently as that's what Bitcoin-Qt gave me with the dumpprivkey command.  I noticed some of the great web-based paper wallet generators like the beauties at bitcoinpaperwallet.com come out in 51 characters base58 (beginning with "5").  They are both considered as being in WIF format?  Is there a difference in functionality for the purposes of importing them for use?  In the event I wanted to use the coin on one of my paper wallets, would my 52 character private key be easily imported into any client or web-based wallet?  Thank-you