Sending multiple update transaction with different nonce at once

Smart Contracts
1

I am trying to send a contract-update transaction from nodeJs back-end.

const updateContractTransaction= {
            header: header,
            payload: updateModule,
            type: AccountTransactionType.UpdateSmartContractInstance,
        };

can I send multiple transaction with auto Increment nonce all at once .

const nonce = await client.getNextAccountNonce(TestnetAccountaddress);
{ nonce: 85n, allFinal: true }

like in this case

transaction1 with = 85n;
transaction2 with = 86n;
transaction3 with = 87n;
(chronologically synchronous with increment)

or their is a chance of transaction2 to be executed first even though transaction1 was recieved first.

will this result in an error?

2

There is no chance of reordering. The nonce determines the ordering.

There is of course a chance that the second transaction fails because the first one fails. But no reordering is possible.