Each confirmation on the litecoin network is much less secure and less certain to actually be included in the litecoin blockchain. Additionally the litecoin network has a much lower hashrate, so it would take a lot less for someone to attack it.

For both of the above reasons even having one confirmation on the litecoin network is generally less secure then having a 0/unconfirmed transaction on the bitcoin network

generally speaking, a well propagated transaction, with a 'proper' tx fee that does not spend any unconfirmed inputs should be considered to be "safe" after only a few seconds on the bitcoin network