Yes the pothos plant is the same as devil's ivy.
Devil's Ivy is just another name for the Pothos plant and the Pothos plant has many other names it's known by as well.
Some other common names for pothos plants besides Devil's Ivy are Ceylon creeper, hunter's robe, golden pothos, Ivy arum, money plant, silver vine and Solomon Islands.
Oh and I almost forgot another common name for Pothos plants besides the above listed names is taro vine.
The pothos plant has the name Devil's Ivy because it's a very hardy plant and is almost impossible to kill the Pothos Plant off.
So that is why Pothos plants are called the Devil's Ivy.