No, this does not matter: "The Asset Loan balances were greater than the Client Liability loans, due to the different interest rates"

The interest, and not the Rate, is only important if you have a loan where that interest is accruing, as when there is unpaid interest owed and you add that to the principal in reality.

Otherwise, the Interest that is not yet owed is not part of the bookkeeping. Example:

The client borrows $100,000 at 3% to loan to a customer at 5%. You simply have $100,000 Asset against the $100,000 liability. Interest is not part of that info and the Rate certainly isn't part of anything but the note paperwork that people are signing.

As the customer makes their payment, the interest is Income to your client. As your client makes their own payment on the borrowed funds, that also is Interest as expense. Both scenarios, in this example, would have them making the exact same principal amount to pay off the loans at exactly the same time.

Now that we've seen how Rate has nothing to do with anything, and how Interest has nothing to do with anything, let's examine how Unpaid Interest might affect this.

Your client has a customer not making a payment for 2 months, so your client accrues the unpaid interest into the principal of the loan balance owed to your client.

And that means they have accrued the interest as income, just unpaid. Now the Principal owed to your client no longer matches the principal your client owes to their own lender. That's fine. That's reality and that is managing each loan separately.

One more scenario:

Let's pretend your client's customer makes an additional $10,000 payment against their principal. Your client is in the middle of closing another deal, and so does not apply this to their own debt balance, but uses it elsewhere. Now your client's principal on that one loan and their customer's balance do not agree. And if your client used the funds for any other reason, such as acquiring something instead of lending or it is sitting as funds in the bank, that is fine. And their two perspectives never match, and that is fine.

The difference is your client's Equity. Not adding to any asset or debt balance. You manage assets and debt balances according to their individual state and activity, and not relative to each other. Example:

You borrow $10,000 to buy a $12,000 piece of equipment. Now the Asset doesn't balance to the Liability. The difference is your Equity. Equity = Net Assets.

AR is the current portion owed to your client, which is principal and interest and might include some sort of fee or penalty. If you remove AR from the perspective, then all loan balances should reconcile each to their own note payable schedule.