So sorry to hear that you had the same contrast stitching and zippers on your Penelope Messenger, Tankgirl...

I was gonna update once I had Marco's reply on what his production side had to say about the issue after the Easter break, but still haven't received that yet (will update here once I do have the final word).
In short, though, it does sound like moving forward, if you want well-matching stitching and zippers, you have to specify that in your order, as they may otherwise use just the thread/zippers that they have on hand in their workshop (rather than waiting for new supplies of the thread/zippers that match better). That's what I gather from Marco's replies so far, but subject to his production side's reply on the issue.
I can appreciate the issues of not having stock of the right thread/zippers on hand, but it's still disappointing (and frankly kind of bewildering) to me that this happened in bags that got produced and sent out, though -- especially because I remember the comments here about the contrast stitching in the first Muse sample/production piece when it was first launched, and seeing Marco's reply to someone on Facebook that the contrast stitching is by request, but the
default/regular feature is matching stitching.

If the closest-matching thread/zippers aren't in stock in the workshop, shouldn't the production side liaise with the customer-facing side so they can alert the customer and see if they're agreeable to the difference, or otherwise willing to wait for new supplies to arrive instead?
So, to me at least, the contrast stitching and zippers on my Penelope Messenger still aren't what I ordered (because unless specified, shouldn't the features/specs all be the default), but it's something that I'll still have to live with or try to get used to too, unless I sell off the bag without even using it (at likely a significant loss). And for any new bags moving forward, I definitely will have to specify that the zippers and thread should match as closely as possible, because each bag still costs a good chunk of change (even if still some way from high-end designer prices)... C'est la vie, I suppose...