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Yes. The intention of the legislator was to cover all isomers, linear and branched, of nonylphenol and their ethoxylates and therefore all of them are covered by the restriction.
The restriction on nonylphenol and nonylphenol ethoxylates was based on the risks identified in the risk assessment report prepared by the United Kingdom under Council Regulation (EEC) No 793/93 of 23 March 1993 on the evaluation and control of the risks of existing substances. The risk assessment report states that "It is understood that nonylphenol (CAS Number: 25154-52-3) as originally defined by CAS (Chemical Abstract Service) covered all nonylphenols. However, subsequent revisions redefined it to cover only straight chain nonylphenol, other isomers having different CAS numbers. Given the method of manufacture of nonylphenols, very little if any straight chain nonylphenol is produced. That which is produced is only likely to be present at very low levels in commercial mixtures. The commercially produced nonylphenols are predominantly 4-nonylphenol with a varied and undefined degree of branching in the alkyl group. This assessment covers commercially produced material (predominantly 4-nonylphenol, branched). This material will also contain smaller amounts of other isomers and impurities, and falls under the CAS Number 84852-15-3."
Therefore Council Directive 76/769/EEC, as amended by Directive 2003/53/EC, did not specify any CAS or EC numbers for nonylphenol. In the revision of the REACH restriction by Regulation 552/2009/EC, which made several technical changes, the CAS and EC numbers were added. This will be corrected by a technical amendment to reflect the intention of the legislator.