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Not necessarily. The 4 prong ECu superceded the 5 prong setup and it a plug-n-play replacement. However, the average DIY'er would grump that his new ECU only had 4 pins and not 5 like his original and therefore must be wrong. So there was a dummy fifth pin put in alot of them to satisfy customer demand.
I doubt you can buy a non-NOS 5 pin ECU that actually needs the four prong ballast anymore. You might find a 5 pin unit, but I'll bet, if I was a betting man, that it has four pin guts and a dummy fifth pin.
I thought I had it straight in my head until I read this.
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