Sorry for the delay in response Malcy, but I've had a look at the Ditto releases on site, and see what you mean...
... A bit hit and miss as to whether you'd get a suffix to cat on a handful of releases or not, and anticipating that there may be more variations to be added to those that do have the suffix, of images of copies without, I accept the are the same release, just with a rather "afterthought" addition to cat number...
(The "A"s and "B" do look offset, and rather "Tacked on")
...So I'll leave your images on this and the other tape, as part of this entry, and rather than amend the primary catalogue number, I've left this number in each case, as it is, but with the full suffixed number as "Other Catalogue Number".
(Assuming that the ones with the suffix were later additions, rather than later removed).
But I'm open to any further thoughts on the subject.
As far as I am aware they were sold as two cassettes in a box like this one DTO 10111A but most have become separated from their partner and box over the years.
I don't think they were ever sold separately.
I'm only guessing but the 'A' and 'B' could have been missed off the original printing and added at a later reprint.
If we had both cassettes or all three parts they could be a single entry as they were originally sold as one item,
with DTO xxxxA as the Cat# DTO xxxxB as the Other Cat# and the cassettes listed as sides 1,2,3,4 or A,B,C,D.
So each of the two Dionne Warwick cassettes you've added images to were available sold together, as a twin pack, albeit not "conjoined"?
... And what you've added are simply the variants of each part?
I wonder, therefore, were the parts available separately, as well as together?
I ask, because I wonder if this was the case, the double set should be on one page, and each of the separately available parts having each their own entry, giving a total of three entries, with links in notes - "available as a twin pack / sold separately between them?
If so, would the additional letters in cat numbers you've added signify the sold separately or post of twin pack version?
... Which is to say, should both of yours be on one page or both of the pre-existing entry images be on one page, and each of yours the individuals?
A lot (if not all) of these ditto releases were twin packs, with cassettes one and two given and 'A' and 'B' on the end of the cat# but this was not always printed on the inlays.
I wouldn't say it's a different product as the track listing is the same and the cat# is only sightly different.