Connectiing an EC2 instance to an RDS volume on another AWS Account

I have two different AWS accounts running EC2 instances and RDS volumes set up in the following way:

AWS Account #1

• EC2 1(Production)


• RDS 1(Production)

AWS Account #2

• EC2 2(Development)


• RDS 2(Development)

The reason I separated the development and production was to take advantage of the AWS free tier usage while we test our app.

My question is whether it's possible for me to access the RDS 2 (Production) from EC2 1 (Development) for testing purposes, and if so how I'd go about doing it. I've been playing around with the VPC settings and can't seem to get it work.

Basically can I access the RDS of one AWS account from an EC2 of another AWS account that I own?