I actually misread this. The Ink Preferred offers a UR signup bonus. The rest offer a "cash" signup bonus which is actually UR points.
EG. For Chase Ink Cash
$750 Cash Back After You Spend $6,000 On Purchases In The First 3 Months From Account Opening: You will receive 75,000 bonus points with this bonus offer, which can be redeemed for $750 cash back. To qualify and receive your bonus, you must make Purchases totaling $6,000 or more during the first 3 months from account opening.
"Cash Back rewards" are the rewards you earn under the program. Cash Back rewards are tracked as points and each $1 in Cash Back rewards earned is equal to 100 points. You may simply see "Cash Back" in marketing materials when referring to the rewards you earn. You may also see, "points" or "Ultimate Rewards points" when referring to the points you can use.