How to migrate to Fargate from EC2 in ECS cluster?

Question

I am planning to migrate to Fargate for autoscaling purposes. I already have task definitions for both my staging and production environments which are currently live. There's two ways I thought I can migrate to Fargate, either create a new Task Definition to use a Fargate and pretty much use the same configuration that my EC2 instance is using. OR, I can export the concerned Task Definition into JSON and replace the values of requiredCompatibilities and compatibilites from EC2 to FARGATE and call it a day, and deploy. Don't know if that would work? Here's a sample Task Definition that I have modified to use FARGATE in aforementioned keys. Some redacted data such as environment variables.

{
  "ipcMode": null,
  "executionRoleArn": null,
  "containerDefinitions": [
    {
      "dnsSearchDomains": null,
      "environmentFiles": null,
      "logConfiguration": {
        "logDriver": "awslogs",
        "secretOptions": null,
        "options": {
          "awslogs-group": "/ecs/MY-PROJECT-staging",
          "awslogs-region": "my-region",
          "awslogs-stream-prefix": "ecs"
        }
      },
      "entryPoint": null,
      "portMappings": [
        {
          "hostPort": 8080,
          "protocol": "tcp",
          "containerPort": 8020
        }
      ],
      "command": null,
      "linuxParameters": null,
      "cpu": 0,
      "resourceRequirements": null,
      "ulimits": null,
      "dnsServers": null,
      "mountPoints": [],
      "workingDirectory": null,
      "secrets": null,
      "dockerSecurityOptions": null,
      "memory": 300,
      "memoryReservation": null,
      "volumesFrom": [],
      "stopTimeout": null,
      "image": "$ECR_REGISTRY/$ECR_REPOSITORY:$IMAGE_TAG",
      "startTimeout": null,
      "firelensConfiguration": null,
      "dependsOn": null,
      "disableNetworking": null,
      "interactive": null,
      "healthCheck": null,
      "essential": true,
      "links": null,
      "hostname": null,
      "extraHosts": null,
      "pseudoTerminal": null,
      "user": null,
      "readonlyRootFilesystem": null,
      "dockerLabels": {
        "env": "staging"
      },
      "systemControls": null,
      "privileged": null,
      "name": "MY-PROJECT-web-stage"
    }
  ],
  "placementConstraints": [],
  "memory": null,
  "taskRoleArn": null,
  "compatibilities": [
    "FARGATE" | Earlier this was EC2
  ],
  "taskDefinitionArn": "task-definition/MY-PROJECT-staging:10",
  "family": "MY-PROJECT-staging",
  "requiresAttributes": [
    {
      "targetId": null,
      "targetType": null,
      "value": null,
      "name": "com.amazonaws.ecs.capability.logging-driver.awslogs"
    },
    {
      "targetId": null,
      "targetType": null,
      "value": null,
      "name": "com.amazonaws.ecs.capability.ecr-auth"
    },
    {
      "targetId": null,
      "targetType": null,
      "value": null,
      "name": "com.amazonaws.ecs.capability.docker-remote-api.1.19"
    },
    {
      "targetId": null,
      "targetType": null,
      "value": null,
      "name": "com.amazonaws.ecs.capability.docker-remote-api.1.18"
    }
  ],
  "pidMode": null,
  "requiresCompatibilities": [
    "FARGATE" | Earlier this was EC2
  ],
  "networkMode": null,
  "cpu": null,
  "revision": 10,
  "status": "ACTIVE",
  "inferenceAccelerators": null,
  "proxyConfiguration": null,
  "volumes": []
}