Ohh...quite funny for yr case. May I know why make you have the idea to do so?

Ohh. But will be very expensive for you to change over and seem not worth. The lawyer fees for name transfer. Also, the Serena owner might sell at high price.

Please re-consider. Previously, I was struggling buying Serena or Zarra. This is wat my own opinion.
I personally prefer Zarra > Serena.

1) In fung shui point of view, Serena 14' high ceiling at living hall but behind only 10-11'. Seem like got BMW head but Kancil rear. No good.
wheress Zarra got more even height of ceiling from living to wet kitchen. 'Good head till good rear'.

2) The upstair of Serena is an open area, easy for beak in, not much usage over there. If cover it up need additional cost. Zarra fully covered.

3) Car Porch too short for Serena. Zarra car porch is an improved version.

4) Serena wet kitchen not cover and rain can come in. Zarra just a small portion not covered.

5) Zarra got bath tub, for double-storey it is a new design. Something new for terrace house.
Well, is still your choice of choosing it.