Is the effect of selling a CE and buying a PE of an option the same?

If selling Reliance CE 1500 and buying Reliance PE 1500 has same effect?

It’s like doing a synthetic short future with delta of 1.

You can read this further below:
https://www.theoptionsguide.com/synthetic-short-futures.aspx

Trading both together you are bearish on stock, you will benefit as long as Reliance is going down and profit potential is unlimited as well, but if Reliance doesn’t go down and goes up there is potential for unlimited loss as well.

Trading only one off the two, your CE option will make profit as long as Reliance is going down or staying below 1500, profit by selling CE is capped to premium received but potential for loss is unlimited. Your PE option will make profit only if Reliance goes down and potential is unlimited as well and loss is capped to premium paid.