"Is there any difference in what the current CDS has done currently than what Sir Michael and his fellow chiefs did then? I believe not, some may say otherwise."
Yes;
The chiefs back then were commenting on political decisions that were having a detrimental effect on the military. They did so after trying to make their point in private.
The current CDS did not speak to Corbyn about his "worries", Corbyn's stance currently has no bearing on the military (and in all probability never will).
Gen Houghton was playing politics and I question why?