Question 1. Sometimes it's not clear what contracts (especially implied ones) already exist. If parties want to solidify everything in a single written agreement, what's the best way of doing this? It may not be possible/easy to individually expressly terminate each one of the existing contracts. This could be a problem because some contracts contain specific details on how they can be terminated (such as "this contract can be terminated by both parties agreeing to it in writing").
From https://www.lawinsider.com/clause/integration-clause is the following clause enforcable and able to over ride termination conditions set forth in other contracts (emphasis mine)?
Integration Clause. Except for the other Loan Documents, this Agreement constitutes the entire agreement between Bank and Borrower regarding the Loan, and all prior oral or written communications between Borrower and Bank shall be of no further effect or evidentiary value.
OTOH I've seen clauses written like this from a different page on lawinsider.com
Merger Clause. This Agreement..., contains the final, complete and exclusive statement of the agreement between the parties with respect to the transactions contemplated herein, and all prior or contemporaneous written or oral agreements with respect to the subject matter hereof are merged herein.
Technically speaking does this terminate any previous contracts? It seems to say "if we forgot anything from a previous agreement, just include it here".
Question 2. Is there any difference between Merger Clauses, Integration Clauses, Entire Agreement Clauses, or are they all names for the same thing?