Resposta curta: sim, se o treinamento tiver sido registrado com a observação de que ele atende aos requisitos de 61.129 e 61.65.
Este tópico tornou-se confuso devido a uma interpretação da FAA que diz:
[...] are the requirements of 14 C.F.R. §61.129(c)(3)(i) [commercial certificate] met by the student getting an instrument rating or training for an instrument rating? The answer is no. The training giving to satisfy the instrument training aeronautical experience of §61.129(c)(3)(i) may also be used to count towards the aeronautical experience of §61.65(e) [instrument rating], but the opposite is not true. The reason for this is that the training required under §61.65(e) is general, while the training under §61.129(c)(3)(i) lists very specific operations that must be accomplished to satisfy the requirements.
Mas essa interpretação foi surpreendente para muitas pessoas porque isso implicava que um certificado comercial requer treinamento de instrumento adicional, mesmo se você já possui uma classificação de instrumento. Então, a AOPA solicitou um esclarecimento (mais informações aqui ); você pode ler a coisa toda, mas a declaração chave da FAA é esta:
We are merely clarifying the requirement that the applicant for a commercial pilot certificate provide evidence that they have met the requirements of §61.129. There is not an exact equivalence between the training required for an instrument rating under §61.65 and the aeronautical experience requirements under §61.129.
Praticamente falando (como explica o artigo da AOPA), isso significa que seu CFII deve explicitamente registrar o treinamento como abrangendo ambos os requisitos:
[AOPA] urges instrument pilot applicants and flight instructors to be sure that instrument training is clearly logged to indicate that the training given meets the requirements of 14 CFR 61.65 as well as those of 14 CFR 61.129. That would avoid questions about the training’s applicability should the pilot one day advance to training for a commercial pilot certificate.