Hi Steve,

Thank you for your question.

A zip & link mattress can have different spring tensions to give the correct support but the upholstery layers will always be the same.  You would not be able to join two mattresses together made by different manufacturers as these types of mattresses are made as a pair.

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I hope the above is of assistance to you, but please do not hesitate to contact our office on 0161 437 4419 to obtain further information and advice.

Kind regards Julie