If anyone does, can they tell me what the primary differences are in the texts of the ordinaries? (I am not asking about the general difference btwn breviaries and dirnals; i know diurnals only contain the day offices)
The biggest difference is that the Anglican Breviary follows the 1911 reformed Roman usage
of the Psalter, so that psalms are chopped up and arranged so that roughly an equal number of verses are said for each day. The Diurnal (and accompanying Matins volume) use the Monastic (i.e. Benedictine) Psalter.
The Benedictine (and, to an extent, the pre-1911 Roman) Psalter more clearly shows the links between the Western divine office and the Byzantine, with things like the little hours and Compline having (mostly) invariable psalms, Lauds beginning with Psalm 50 and ending with Psalms 148-150 (corresponding with the second half of Byzantine Matins), and Matins having two nocturns on feriae (two kathismata at Matins) and three on feasts (two kathismata + Psalm 118 / Polyeleos in the Byzantine).
Other differences in the ordinary are inherent to the variations between Roman and Benedictine usage, e.g. the Benedictine usage replaces the scripture readings at ferial Matins with a short lesson during the summer months, ferial matins has two nocturns rather than one, etc.