That wasn’t the same band. Saxon was there, but it wasn’t the same band as far as I know. Hence, the different name.
Like many bands they evolved their music as their band members and band names changed. Wikipedia:
By mid-1968, with their commercial popularity flagging, the group’s personnel began to change; the band was renamed “Sky Saxon and the Seeds” in 1969, by which point Bob Norsoph, guitar, and Don Boomer, drums, had replaced Savage and Andridge. Saxon continued to use the name “The Seeds”, using various backup musicians, at least through 1972; the last major-label records of new material by The Seeds—two non-charting singles on MGM records—were released in 1970.
After the dissolution of the Seeds, Sky Saxon joined the Yahowha religious group,....
https://www.youtube.com/watch?v=XqVAEq2HNZI