The demo version of Lonely Sea on that tape is supposed to be the same as the finished track from the album but without the backing vocals, which were overdubbed later on at Capitol.
And AFAIK, the whole thing was recorded on 3 track, at least the stuff recorded at Captiol's studio. Some of the earlier recordings like 409 and Surfin' Safari have a different recording history.
"Surfin'" was recorded at World-Pacific Studio, which was either 2-track or binaural. "Surfin' Safari" & "409" were recorded at Western, on either 2- or 3-track. The remainder was cut at the Capitol tower, on 3-track.