There isn't an Ensure product that is formulated similarly to Soylent at the moment. Ensure has two products with a similar calorie count compared to Soylent (Ensure 350g vs Soylent 400g). Here's how they break down:

Soylent Drink: 400cal, 21g fat, 20g protein, 36g total carb. 9g sugar.

Ensure Plus: 350cal, 11g fat, 13g protein, 57g carb. 22g sugar.

Ensure Enlive: 250cal, 11g fat, 20g protein, 45g carb. 22g sugar.

As you can see, Soylent has more fat, which provides 9 cal/gram compared to 4cal/gram from carb/protein. This allows it to hit its calorie goal without adding nearly as many carbs and sugars.