Cloudformation conditionals Yaml

I have to create an auto scaling group in two regions and the only difference between the two are the subnets. us-east-1 has 1 subnet whereas us-east-2 has two. How can I use the condition to call the subnet value from region map.

Mappings:
  RegionMap:
    us-east-1:
      AMI: "ami-066f487d3b6819b0d"
      Subnet1: "subnet-0e6f12f64042ea5b1"
    us-east-2:
      AMI: "ami-0aef5e0adcbc7cc0f"
      Subnet1: "subnet-0e6f12f64042ea5b1"
      Subnet2: "subnet-0bc661bb8d98f3f03"

Conditions:
  region: !Equals [!Ref us-east-2, Subnet2]

  autoscaling:
    Type: AWS::AutoScaling::AutoScalingGroup
    Properties:
     开发者_高级运维 AutoScalingGroupName: asg1
      VPCZoneIdentifier: 
        - !FindInMap [RegionMap, !Ref "AWS::Region", Subnet1]
        - If regions = us-east-2 then !FindInMap [RegionMap, !Ref "AWS::Region", Subnet2] # This is what I need to figure out

I couldn't find any examples of this. Has anyone used a region map and used conditionals with it?