That may be, though the discharge curves on the data sheets seem very similar. 
Note that the two data sheets use different discharge rates, like 2000 mAh vs 
2500 mAh. They both have the same specs for "Internal Impedance (after 
discharge to E.V.=1.0V)”: Approx. 25mΩ(at 1KHz). I have to admit that I have no 
idea what that means.

Eneloop: https://eneloop101.com/wp-content/uploads/BK-3MCC-AE.pdf 
<https://eneloop101.com/wp-content/uploads/BK-3MCC-AE.pdf>
Eneloop Pro: https://eneloop101.com/wp-content/uploads/2017/02/BK-3HCC.pdf 
<https://eneloop101.com/wp-content/uploads/2017/02/BK-3HCC.pdf>

These are for the latest generation of each.

wunder
K6WRU
Walter Underwood
CM87wj
http://observer.wunderwood.org/ (my blog)

> On Jun 25, 2019, at 6:10 AM, Chip Stratton <[email protected]> wrote:
> 
> I think Eneloop Pro have a higher internal resistance than the regular 
> Eneloop. In my experience, using both of them sequentially, the KX3 went more 
> quickly to the enforced 5 watt maximum output with the Eneloop Pro cells 
> compared to the standard Eneloop, despite the higher ultimate capacity of the 
> Eneloop Pro. But, YMMV!
> 
> Chip
> AE5KA
> 
> On Mon, Jun 24, 2019 at 9:32 PM Walter Underwood <[email protected] 
> <mailto:[email protected]>> wrote:
> Right, Eneloop Pro get 500 cycles instead of 2000 for regular Eneloop. But 
> I’m OK with 500 charge cycles and getting 2550 mAh instead of 2000 mAh.
> 
> The Wikipedia page for Eneloop is fairly informative.
> 
> https://en.wikipedia.org/wiki/Eneloop <https://en.wikipedia.org/wiki/Eneloop>
> 
> wunder
> K6WRU
> Walter Underwood
> CM87wj
> http://observer.wunderwood.org/ <http://observer.wunderwood.org/> (my blog)
> 
> > On Jun 24, 2019, at 5:15 PM, Dave Sublette <[email protected] 
> > <mailto:[email protected]>> wrote:
> > 
> > IIRC, the Eneloop Pro has fewer recharge cycles than do the regular
> > Eneloops.
> > 
> > K4TO
> > 
> > On Mon, Jun 24, 2019 at 7:57 PM John Harper <[email protected] 
> > <mailto:[email protected]>> wrote:
> > 
> >> Panasonic Eneloop Pro
> >> 
> >>> Best KX3 batteries
> >> 
> >>> My old rechargeable batteries are failing.   Recommdation for
> >> replacements?
> >> 
> >> 
> >> John AE5X
> >> https://ae5x.blogspot.com <https://ae5x.blogspot.com/>
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