Can a defendant plead guilty to two or more different criminal charges under section 954 of the California Penal Code?

"Section 954 provides that 'two or more different offenses' may be charged in the same pleading if the offenses are either 'connected together in their commission' or 'of the same class.' This 'statute permits the joinder of different offenses, even though they do not relate to the same transaction or event, if there is a common element of substantial importance in their commission, for the joinder prevents repetition of evidence and saves time and expense to the state as well as to the defendant.' [Citation.]" (People v. Armstrong (2016) 1 Cal.5th 432, 455

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