Yes. You need to change to thicker mm piping to support the R410 refrigerant.

of course, there is still alot of shop selling non inverter air cond

can just go for those with newer gas.

just flush and vacuum the previous pipes and you are good to go. just make sure there are no leaks in the old pipes.

It depends on the model of the AC chosen. Sometimes even for the same HP, its spec calls for a bigger piping usually seen for the next higher HP AC. The opposite is also true. Some models, like Daikin can use even a pipe usually spec'ed for lower HP of other brand models e.g. their 2HP over 1.5HP or 3HP over 2.5HP of other brand models.

Get your regular AC guy to tell you the pipe size (record them down) of each AC point by their liquid (narrower) + gas (wider) e.g. 1/4" + 3/8" (standard 1HP) or 1/4"or 3/8" + 1/2" (1.5HP or 2HP) or 3/8" or 1/2" + 5/8" (2.5HP typically), etc. Once you know the pipe size compare that to the Daikin model that matches. For the same HP, if the pipes exceed that which was specified, it can be used but not the other way round...ie it cannot be smaller than the pipe size specified for the model. Ensure pipes are leak free esp if using older pipes for R32 gas which is mildly flammable. Best is to use newer pipes.