Inquiries about the MSL difference between the datasheet and the packaging label of TI parts is a common question. Such as ISO1050DUBR, datasheet shows this is Level 4, but you may see it listed as Level 3 on the label.
One reason for this difference is because the part was manufactured by two different assembly locations for this product, and one is MSL 4 and the other is MSL 3.
Here is a useful tool from TI for Moisture Sensitivity Level Search
Moisture Sensitivity Level Search | Texas Instruments