I'm not sure if this was well known beforehand but for those that are curious about the ping difference of teams from different teams in APAC, it has been revealed that before a series begins ,a ping test is conducted by players to choose a suitable server where the ping is fair, a VPN can also be used if players applied to riot to use one before the match. So not all series are conducted on SG servers and be assured that the teams are competing at a very fair playing field.
Source:(valorant_tw twitch chat)VALORANT_TW: 選手賽前都會做 ping 的測試，協調確認對戰組合使用的伺服器，如有需要也可以申請使用 VPN 唷 -
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