Drechsler’s Opus 9 represents the transition from the late Classical style toward early Romantic brilliance in piano-forte writing. The variations demonstrate an increased focus on keyboard range and dynamic contrast.
The primary challenge is maintaining rhythmic steadiness while executing increasingly rapid sixteenth-note patterns.
Comparable difficulty and character — good candidates for what to learn next.
10 Variations pour le piano-forte (Op.9) is rated Henle level 4 of 9 — intermediate repertoire, roughly ABRSM grades 5–6. In the RCM system it corresponds to about level 6.
You should be comfortable at Henle level 4 — meaning you can already play level 3–4 pieces cleanly. Learning it one level early is possible as a stretch piece, but more than that usually leads to months of frustration.
A typical performance of 10 Variations pour le piano-forte (Op.9) lasts about 6 minutes.
10 Variations pour le piano-forte (Op.9) is available as free public-domain sheet music on IMSLP — the score is linked directly from this page.
Pieces at a comparable difficulty and character include Alexander's Ragtime Band by Irving Berlin, 'S Wonderful by George Gershwin, Solfegetto in C minor, H 220 by Carl Philipp Emanuel Bach — see the full similar-pieces list on this page.