I would say that the Fontana was first, as it looks like a full price issue, and Sunset was United Artists' lower priced reissue label, and that issue is probably from about 1970 or so, the company name Liberty/UA Records Ltd.only came into use after those labels ended their relationship with Philips/Fontana and moved to EMI for distribution The original (P) date still applies to all subsequent issues, and represents the date of first publication, not the release date.
You get these little life's discretion when it comes to listings! I have a copy of this as a UK record, but on a different label, in this case Fontana, for which I will enter here, and link it with this Sunset copy. However, The difference shown here compared to mine is the timing of track A3, mine shown is 2:39, The Sunset one is 2:24. The composer on track B1 and the title on mine is Potts (Sunset's is Betts - even though on both, he is an arranger), the title on mine listed is Mexicalli Rose on the back, the label has Mexicalli Nose (Sunset's is Mexicali Nose on the back of cover, Mexicale Nose on the label!). Track A4's composer - mine is Walker, Young, Holt, Storball, Sunset's just Walker & Young. Composer on track B3 is Bono, indeed the Sunset's label has Bono, but the listing above has Sonny.
Mine was released in 1967, the same as Sunset's - the question is, which came first?