TM6 accessories like knife and bowl are not compatible with the TM5 and vice versa. The bowls for each device can be inserted into the other, but you won’t be able to cook with the wrong bowl and you will receive a system error message.
The splash guard is not compatible with the TM5.
The splash guard is to be used, only when required from the specific recipe on the TM.
The basket, lid, butterfly whisk, and Varoma can be used in either the TM5 or the TM6.