What is the test for evidence of intent when the evidence of an uncharged crime is used to prove identity?

When the evidence of an uncharged offense "is introduced to prove intent, the prosecution need not show the same quantum of 'similarity' as when the uncharged conduct is used to prove identity." (People v. Robbins (1988) 45 Cal.3d 867, 880, 248 Cal.Rptr. 172, 755 P.2d 355.) Only substantial similarity is required. (Ibid.) Here, the similarities between the uncharged robbery and the charged offenses are numerous and substantial. The prosecutor aptly described the "striking similarities between these two plans" below: