

UK-Beijing-Guanzhou-Hong Kong
I am looking at 2 different options to visit China
First option is to fly from the UK, to Beijing, stay there for 4 nights and then fly from Beijing to Guanzhou for 4 nights and then finally take the high speed railway from Guanzhou to Hong Kong West Kowloon station and stay in Hong Kong for 5 nights before coming back to the UK.
2nd option is not to go to Beijing and just fly into Guanzhou for 5 nights from the UK and then take the high speed railway from Guanzhou into Hong Kong West Kowloon station and stay there for a few nights before coming back to the UK
Can you let me know whether either of these itinerary are possible on the 240Hr TWOV?
If they are, do I need to buy the train tickets from Guanzhou to Hong Kong on an official site, or can I just use a site such as trip.com or Klook?
Thank You