Ward [ward1953] identified the model as coming from Casteliono’s 1536 print where it is attributed to Francesco [1536/9, nº 16, fols. 55-56v]. This source was no doubt known in Spain (the design of Narváez’s Delfin is based on it). Robinson [robinson2014-1] reaffirms Ward’s finding but, following Vaccaro’s identification of the works as being by da Rippe (published by Le Roy in 1553).

Robinson (p. 2) observes: “It [i.e. the Rippe fantasia] was also parodied in Enriquez de Valderrabano's vihuela print Silva de Sirenas, Valladolid, 1547, apparently knowingly since he acknowledged it was contrahecha del milanes in the index (no 21c), again some years prior Le Roy's publishing it in 1553. The style of no 21 seems consistent with composition by de Rippe rather than Francesco, and it is possible that Casteliono's ascription was in error, which was then transmitted directly or indirectly to Valderrabano.

Ward gives the parodied passages as follows

Vald Rippe 21
1-8 1-12
9-12
13-19 13-23
19-28
29-41 27-39
42-45 86-90 (a free rendering)
46-114

Parody Fantasia, based on one by Albert de Rippe, although misattributed to Francesco da Milano in Casteliono (Brown 15369) Model = Ness no 23, and De Rippe No 21 (Fantasias ed Vaccaro). The model and parody differ in structure and style. The model is more sectionalized with a greater number of clear points of imitation than the parody which is Valderrabano’s freer style.
Ward (p 233) fairly accurately lists the parodied sections, which other than the opening counterpoint, are small phrases of not great consequence to the structure of the model. Valderrabano does not include the elaborate cadential and pre-cadential music of the model’s style to enunciate a form, but makes each phrase continues into the next without pause. Parody is restricted to the first 50 compases of the 114 total that is the first half. This half is largely built on borrowed material, much of it stripped of ornament by Valderrabano.

My comparison of model and parody is shown elsewhere

The work sectionalizes: (see below)