To echo Gorshin - Ehhhhh?
With the exception of one track Darlene Love's "Christmas (Baby Please Come Home)". There are no original Phil Spector "tunes" on the album.
The arrangements however are in his patented "Wall of Sound" style, performed by The Wrecking Crew (the team of LA session musicians employed on most of his sessions of the era). You may hear orchestral arrangements
similar to "Then He Kissed Me" in there, but then you'll hear them in almost any other dozen or so Spector productions. You certainly won't hear the "tune" of the song however.
None of the tracks "re-use" any of the artists' backing tracks of the time. They were recorded specifically for this album. Indeed the opposite applies, in that the aforementioned "Christmas (Baby Please Come Home)", was re-used a year later with non-seasonal lyrics and released as "Johnny (Baby Please Come Home)", again by Darlene Love.