St Gertrude the Great

St Gertrude, mystic and prophetess, ornament of the Benedictine order, is a favourite saint of mine – would that I had relied more on her powerful prayers. I noticed to-day that her Collect in the Monastic Breviary (which has a whole proper Office for her feast) is subtly different to that in the Roman Breviary:

Monastic:

Deus, qui in purissimo corde beatæ Gertrudis Virginis tuæ jucundam tibi habitationem præparasti: ejus meritis et intercessione cordis nostri maculas clementer absterge; ut digna divinæ majestatis tuæ habitatio effici mereatur. Per...

Roman:

Deus, qui in corde beatæ Gertrudis Virginis jucundam tibi mansionem præparasti: ipsius meritis et intercessione; cordis nostri maculas clementer absterge, et ejusdem tribue gaudere consortio. Per…

I wonder which is the original, since they are obviously different versions of the same prayer; the Monastic appears to be the longer, but also to have a more unified theme as it were, so perhaps the Roman is a condensed edition.