Will I get the same agent?

Jenkinsfile

// In the following pipeline the stages that start with 'Build: ' needs to run
// on the same node and in the same workspace, the same is true for the stages
// that begin with 'Test: '
// Will this be the case as the pipeline is written?
// If not, can I force the pipeline to do so?

pipeline {
    options {
        skipDefaultCheckout()
    }
    environment {
        // In a real world pipeline this would be calculated via git-describe
        GIT_TAG = 'v1.1'
    }
    stages {
        stage('Build: Run') {
            agent {
                label 'builder'
            }
            steps {
                cleanWs()
                checkout scm

                // Builds src/ and stores artifacts under build/
                bat 'builder.bat build src/ build/'
            }
        }
        stage('Build: Archive') {
            agent {
                label 'builder'
            }
            steps {
                // Compresses the build dir
                bat 'archiver.bat archive build/ build-${env.GIT_TAG}.zip'

                // Saves under some artifact network share
                bat 'archiver.bat store-archive build-${env.GIT_TAG}.zip'
            }
        }
        stage('Test: Fetch Archive') {
            agent {
                label 'tester'
            }
            steps {
                cleanWs()

                // Gets the build artifacts from the artifact network share
                bat 'archiver.bat get-archive build-${env.GIT_TAG}.zip'

                // Uncompresses the build artifacts under build/
                bat 'archiver.bat unarchive ${env.GIT_TAG}.zip build/'
            }
        }
        stage('Test: Run') {
            agent {
                label 'tester'
            }
            steps {
                // Run tests and store results under tests/
                bat 'tester.bat test build/ tests/'
            }
        }
        stage('Test') {
            agent {
                label 'tester'
            }
            steps {
                // Compresses the test results dir
                bat 'archiver.bat archive tests/ tests-${env.GIT_TAG}.zip'

                // Saves under some artifact network share
                bat 'archiver.bat store-archive tests-${env.GIT_TAG}.zip'
            }
        }
    }
}