Can Litecoin & Bitcoin have overlapping Transaction Ids (txid)
Litecoin uses Scrypt as its mining algorithm, but transaction identifiers (txids) are still produced using SHA256d. Litecoin started with a different genesis block, so there is no overlapping history in the blockchains.
It is extremely unlikely for any transactions to ever collide in their txids, simply because 2256 is such an extremely large digest space, whether that is within Bitcoin or across Bitcoin and Litecoin.