One, use Caps-a-Holic.com with PNG clicked along with full-screen comparisons to check. Twilight Time usually has shite compression so I’d automatically use Arrow instead.
Two, both appear to be the original audio. Twilight Time (Re-release) uses lossless DTS-HD Master Audio at 48kHz, 24-bit and the UK Arrow uses uncompressed LPCM at 48kHz, 24-bit.
Three, I don’t really think it needs it but other Sam Peckinpah movies should. (Great or adequate HD video with film grain perhaps on The Getaway and The Wild Bunch but with uncompressed Laserdisc audio.)
Four, the Limited Edition is currently on sale on Arrow Shop for only £12.99/$16.83. https://www.arrowfilms.co.uk/shop/index.php?route=product/product&keyword=Bring &product_id=887
(IMO Twilight Time aren’t worth it to own at all.)
Five, best to focus on titles which have far less than adequate Blu-ray disc releases from around the planet. i.e. the aforementioned Sam Peckinpah titles.

I’d love to see an HD (1080i/p) preserved 2-Disc custom BD25s for both uncensored cuts of Pat Garrett & Billy the Kid. 2005 Special Edition (115:08) and the 1988 Turner Preview Version (121:28). Maybe even a Theatrical Cut reconstruction too on a BD25. BUT my guess is Warner Archive will eventually release an awesome pressed Blu-ray disc for it.