https://www.rugbyleagueproject.org/seasons/nswrfl-1970/major-semi/south-sydney-rabbitohs-vs-manly-warringah-sea-eagles/summary.html
The starting lineup numbers you have listed (for both teams) looks correct in the video however at 6:45 + 6:59, you can see the number 20 for Souths. I assume this is Kerry Burke.
https://www.nrl.com/news/2026/07/24/rabbitohs-v-sea-eagles---1970-major-semi-final/