Looks like they're probably one and the same

Fuller's Index shows:
Lotus Inn Casino
1213 Las Vegas Blvd., South
Las Vegas
Ctark
5-25-73
12-1-78 SL-21

Checking 1969 yellow pages, the ad shows:
LOTUS INN
FIRST IN HOSPITALITY
LOCATED IN
"MIDDLE OF ALL THE ACTION"

*Therapeutic Pool
* Free Sauna Baths Swimming Pool
* Cocktail Lounge
*RESTAURANT • OPEN 24 HRS.
For Reservations Call - 384-7181
1213 LAS VEGAS BLVD. SOUTH

The Lotus Inn is also mentioned under Restaurants, in the Sambo's Ad