Replacing a spa is still a review of the whole arrangement
A similar footprint does not prove the new model matches the existing installation.

Compare actual models
Give the professional the old and new model information where available, together with existing installation records. Ask what can be reused and what must be assessed or changed. Do not assume an existing cable, connection or protective arrangement suits the new equipment.
Include the existing condition
Have the responsible professional identify which parts of the current installation are within their review. Record access limits and any changes since the original work. A replacement quotation should state assumptions rather than silently treat the existing system as verified.
Update the owner’s file
Obtain records for the actual replacement and changes made, including relevant authority outcomes and the new operating instructions. Keep the old record as history, not as documentation for the new model. Clarify who handles removal, installation and warranty support.
Questions to take forward
- Which existing parts are proposed for reuse?
- Who confirms compatibility and condition?
- What records describe the replacement work?