The real difference — sola Scriptura vs tradition as a second equal divine word
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The real split: Reformed hold that everything needed for faith and religion can be drawn and proved from Scripture alone — no second faith-principle to which Scripture remits us for fuller teaching, and no rule of faith outside Scripture.
Roman doctors deny that faith dogmas and religion's institutes can be proved sufficiently from Scripture without intervening Church doctrine and tradition, which they take as another part of the divine word equal in authority with sacred Scripture.
Latin
XXIII. Sed discrimen in eo est, quod omnia quae ad fidem & religionem necessaria sunt, contendimus ex Scriptura ita peti & probari posse, ut opus non sit alio fidei principio, ad quod Scriptura nos remittat plenius erudiendos. Nec etiam ullum fidei principium & regulam extra Scripturam agnoscimus. Doctores vero Ecclesiae Romanae omnia fidei dogmata, & religionis instituta ex Scriptura sufficienter probari non posse contendunt, nisi interveniente Ecclesiae doctrina atque traditione, quam tanquam alteram verbi divini partem paris cum Scriptura sacra authoritatis suscipiendum esse docent.