Potentially off-topic but I think it's worth noting that award charts are also different for redemptions on BAEC vs IB+ for most partner airlines - I wasn't the most diligent in a recent search and almost ended up paying 42k Avios + €220 for a KUL-ICN Y return on MH, when it only costs 25k + £30 for the exact same itinerary. Didn't pay too much attention to this and now the 90k Avios I obtained, while technically free (since I booked a trip to Spain), is worth much less than I expected them to be.
Same here. I wanted to redeem the bonus avios for KUL-AKL. I checked BA.com, seats were available (economy) for the dates I wanted, and the tax was only $60. When I called Iberia to make the reservation, I was told the taxes would be ~360 Euros.