RPL to CPL (Australia)

Hello guys,

I'm currently doing my RAAus RPC and converting it to an RPL in the near future. I want to do flying for a living (hopefully in the end be up in the airlines). My plan is to complete my RPC and get my XC endorsement, build some hours up while I'm still in high school and after graduation see where I can go from there.

Today my instructor told me he went from his RPL to his CPL (which I believe comes with additional training) which I did not think was possible. I'm highly considering this, as it'll save me from doing extra exams, and hopefully some money too. Are there any implications to doing this? Having my XC endorsement is pretty much a lite-PPL so surely I wouldn't miss out on too much besides heavier planes?